PLEASE HELP

Ive had this cut in my urethra tip for 3 months and It wont heal. Im 18 and ive had all type of blood tests and cell tests and it is not an std but its still there. Ive put vaseline / neosporin on it for weeks, ive put anti fungal / bacterial ointment. I even tried watered down alcohol, peroxide, and even watered down iodine. It doesnt burn but sometimes it stings when the pee comes out on the cut. Sometimes it puffs up after masturbation. Please what is the cause of this! Help!

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Has a Medical professional actually examined this … ? If so what were they, Doctor or other specialist …